#include<bits/stdc++.h>
using namespace std;

int main()
{
	int old,ans;
	cin>>old;
	if(old>10)
		ans=25*3*5;
	else if(old>=7 and old<=10)
		ans=15*3*5;
	else if(old>=3 and old<=6)
		ans=5*3*5;
	
	if(ans%120==0)
		cout<<ans/120<<endl;
	else
		cout<<ans/120+1<<endl;
	return 0;
}
